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I dont know where the fuse box on an 08 is. But if you want to hook up an amp... go through the firewall (use a rubber grommet) and hook straight to the battery and fuse within 18" of battery. Ground wire.. hook straight to the chassy of car. Remote turn on lead to head unit remote turn on wire. Keep signal wires (rca's) away from power lines.
 

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Also to not void your warrenty do not cut into any of the original wiring from the factury. You can void all of the warrenty by cutting or splicing into the factory harness, not a good idea.
 
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